Kaiki starts to research his target, Nadeko Sengoku, the junior high school girl who became a god of North Shirahebi Shrine. As Kaiki investigates her background, he finds her secret, which she has never told anyone, including her beloved Koyomi Araragi. Can Kaiki save Hitagi and Koyomi before time is up?!

Hitagi Senjougahara made a deal with the gods with her life in order to protect Koyomi Araragi. As winter holidays approach with the promised destined day , she chose the darkest and the worst option…